Abstract: A cursor is displayed clearly without glimmering, in the display control device and the display apparatus which suppress the dissipation currents used in the data transfer to a much lower level, by reducing the quantity of data transfer between the image memory and the display means. The controller 15 calculates a cursor range that is subject to a process of a cursor display. Then, the controller 15 determines a divided area from which the gradation information is to be read, based on the cursor range calculated, and the data of the cache memory 15a indicating the divided area into which the information of intermediate gradation is stored in the image data storage unit 3a. And then, the controller 15 reads the gradation information from the divided area, and writes the data into the built-in memory 2a, based on the cursor range, the gradation information, and the current frame number.

Abstract: Liquid crystal displays (LCD) have a number of different gradation levels defining the colors in pixels. Blends of the colors and gradation levels of each color are used to change the colors of dots in the LCD. Both the gradation data and address of the data must be transferred from an image data storage to a driver (controlled by a controller) to update the display. This necessarily leads to the transfer of a large amount of data and consequently leads to the use of a correspondingly large amount of current and the consumption of a large amount of power. To decrease the power consumption, an on/off flag is set for each dot in each of the 15 frames that compose a display screen. The gradation of a dot is determined by ratio of on/off states. The state is held for continuous driving by the driver until the next value is written to the memory, i.e. only dots that have intermediate gradations will have a state change.